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1/*
2 * chromeos_pstore.c - Driver to instantiate Chromebook ramoops device
3 *
4 * Copyright (C) 2013 Google, Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, version 2 of the License.
9 */
10
11#include <linux/dmi.h>
12#include <linux/module.h>
13#include <linux/platform_device.h>
14#include <linux/pstore_ram.h>
15
16static struct dmi_system_id chromeos_pstore_dmi_table[] __initdata = {
17 {
18 /*
19 * Today all Chromebooks/boxes ship with Google_* as version and
20 * coreboot as bios vendor. No other systems with this
21 * combination are known to date.
22 */
23 .matches = {
24 DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
25 DMI_MATCH(DMI_BIOS_VERSION, "Google_"),
26 },
27 },
28 {
29 /* x86-alex, the first Samsung Chromebook. */
30 .matches = {
31 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
32 DMI_MATCH(DMI_PRODUCT_NAME, "Alex"),
33 },
34 },
35 {
36 /* x86-mario, the Cr-48 pilot device from Google. */
37 .matches = {
38 DMI_MATCH(DMI_SYS_VENDOR, "IEC"),
39 DMI_MATCH(DMI_PRODUCT_NAME, "Mario"),
40 },
41 },
42 {
43 /* x86-zgb, the first Acer Chromebook. */
44 .matches = {
45 DMI_MATCH(DMI_SYS_VENDOR, "ACER"),
46 DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"),
47 },
48 },
49 { }
50};
51MODULE_DEVICE_TABLE(dmi, chromeos_pstore_dmi_table);
52
53/*
54 * On x86 chromebooks/boxes, the firmware will keep the legacy VGA memory
55 * range untouched across reboots, so we use that to store our pstore
56 * contents for panic logs, etc.
57 */
58static struct ramoops_platform_data chromeos_ramoops_data = {
59 .mem_size = 0x100000,
60 .mem_address = 0xf00000,
61 .record_size = 0x20000,
62 .console_size = 0x20000,
63 .ftrace_size = 0x20000,
64 .dump_oops = 1,
65};
66
67static struct platform_device chromeos_ramoops = {
68 .name = "ramoops",
69 .dev = {
70 .platform_data = &chromeos_ramoops_data,
71 },
72};
73
74static int __init chromeos_pstore_init(void)
75{
76 if (dmi_check_system(chromeos_pstore_dmi_table))
77 return platform_device_register(&chromeos_ramoops);
78
79 return -ENODEV;
80}
81
82static void __exit chromeos_pstore_exit(void)
83{
84 platform_device_unregister(&chromeos_ramoops);
85}
86
87module_init(chromeos_pstore_init);
88module_exit(chromeos_pstore_exit);
89
90MODULE_DESCRIPTION("Chrome OS pstore module");
91MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0
2// Driver to instantiate Chromebook ramoops device.
3//
4// Copyright (C) 2013 Google, Inc.
5
6#include <linux/acpi.h>
7#include <linux/dmi.h>
8#include <linux/module.h>
9#include <linux/platform_device.h>
10#include <linux/pstore_ram.h>
11
12static const struct dmi_system_id chromeos_pstore_dmi_table[] __initconst = {
13 {
14 /*
15 * Today all Chromebooks/boxes ship with Google_* as version and
16 * coreboot as bios vendor. No other systems with this
17 * combination are known to date.
18 */
19 .matches = {
20 DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
21 DMI_MATCH(DMI_BIOS_VERSION, "Google_"),
22 },
23 },
24 {
25 /* x86-alex, the first Samsung Chromebook. */
26 .matches = {
27 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
28 DMI_MATCH(DMI_PRODUCT_NAME, "Alex"),
29 },
30 },
31 {
32 /* x86-mario, the Cr-48 pilot device from Google. */
33 .matches = {
34 DMI_MATCH(DMI_SYS_VENDOR, "IEC"),
35 DMI_MATCH(DMI_PRODUCT_NAME, "Mario"),
36 },
37 },
38 {
39 /* x86-zgb, the first Acer Chromebook. */
40 .matches = {
41 DMI_MATCH(DMI_SYS_VENDOR, "ACER"),
42 DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"),
43 },
44 },
45 { }
46};
47MODULE_DEVICE_TABLE(dmi, chromeos_pstore_dmi_table);
48
49/*
50 * On x86 chromebooks/boxes, the firmware will keep the legacy VGA memory
51 * range untouched across reboots, so we use that to store our pstore
52 * contents for panic logs, etc.
53 */
54static struct ramoops_platform_data chromeos_ramoops_data = {
55 .mem_size = 0x100000,
56 .mem_address = 0xf00000,
57 .record_size = 0x40000,
58 .console_size = 0x20000,
59 .ftrace_size = 0x20000,
60 .dump_oops = 1,
61};
62
63static struct platform_device chromeos_ramoops = {
64 .name = "ramoops",
65 .dev = {
66 .platform_data = &chromeos_ramoops_data,
67 },
68};
69
70#ifdef CONFIG_ACPI
71static const struct acpi_device_id cros_ramoops_acpi_match[] = {
72 { "GOOG9999", 0 },
73 { }
74};
75MODULE_DEVICE_TABLE(acpi, cros_ramoops_acpi_match);
76
77static struct platform_driver chromeos_ramoops_acpi = {
78 .driver = {
79 .name = "chromeos_pstore",
80 .acpi_match_table = ACPI_PTR(cros_ramoops_acpi_match),
81 },
82};
83
84static int __init chromeos_probe_acpi(struct platform_device *pdev)
85{
86 struct resource *res;
87 resource_size_t len;
88
89 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
90 if (!res)
91 return -ENOMEM;
92
93 len = resource_size(res);
94 if (!res->start || !len)
95 return -ENOMEM;
96
97 pr_info("chromeos ramoops using acpi device.\n");
98
99 chromeos_ramoops_data.mem_size = len;
100 chromeos_ramoops_data.mem_address = res->start;
101
102 return 0;
103}
104
105static bool __init chromeos_check_acpi(void)
106{
107 if (!platform_driver_probe(&chromeos_ramoops_acpi, chromeos_probe_acpi))
108 return true;
109 return false;
110}
111#else
112static inline bool chromeos_check_acpi(void) { return false; }
113#endif
114
115static int __init chromeos_pstore_init(void)
116{
117 bool acpi_dev_found;
118
119 /* First check ACPI for non-hardcoded values from firmware. */
120 acpi_dev_found = chromeos_check_acpi();
121
122 if (acpi_dev_found || dmi_check_system(chromeos_pstore_dmi_table))
123 return platform_device_register(&chromeos_ramoops);
124
125 return -ENODEV;
126}
127
128static void __exit chromeos_pstore_exit(void)
129{
130 platform_device_unregister(&chromeos_ramoops);
131}
132
133module_init(chromeos_pstore_init);
134module_exit(chromeos_pstore_exit);
135
136MODULE_DESCRIPTION("ChromeOS pstore module");
137MODULE_LICENSE("GPL v2");